first upload all files

Modules/Compare/Compare.php

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+<?php
+
+namespace Modules\Compare;
+
+use JsonSerializable;
+use Modules\Product\Entities\Product;
+use Darryldecode\Cart\Cart as DarryldecodeCart;
+use Illuminate\Database\Eloquent\Collection as EloquentCollection;
+
+class Compare extends DarryldecodeCart implements JsonSerializable
+{
+    public function store($productId)
+    {
+        $product = Product::with('files', 'attributes.attribute')
+            ->with('reviews')
+            ->withCount('options')
+            ->findOrFail($productId);
+
+        return $this->add([
+            'id' => $product->id,
+            'name' => $product->name,
+            'price' => $product->price->amount(),
+            'quantity' => 1,
+            'attributes' => compact('product'),
+        ]);
+    }
+
+    public function hasAnyProduct()
+    {
+        return $this->products()->isNotEmpty();
+    }
+
+    public function count()
+    {
+        return $this->products()->count();
+    }
+
+    public function products()
+    {
+        return $this->getContent()->map(function ($item) {
+            return $item->attributes->product;
+        });
+    }
+
+    public function attributes()
+    {
+        return $this->products()->flatMap->attributes->unique('name');
+    }
+
+    public function relatedProducts()
+    {
+        return $this->products()->load(['relatedProducts' => function ($query) {
+            $query->forCard();
+        }])->pluck('relatedProducts')->flatten();
+    }
+
+    public function list()
+    {
+        return $this->products()->pluck('id');
+    }
+
+    public function getContent()
+    {
+        return new EloquentCollection($this->session->get($this->sessionKeyCartItems));
+    }
+
+    public function jsonSerialize()
+    {
+        return [
+            'products' => $this->products(),
+            'attributes' => $this->attributes(),
+        ];
+    }
+
+    public function __toString()
+    {
+        return json_encode($this->jsonSerialize());
+    }
+}